From: David Howells <dhowells@redhat.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: dhowells@redhat.com, jlayton@kernel.org,
linux-afs@lists.infradead.org, ceph-devel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] afs: Fix afs_write_end() to handle short writes
Date: Mon, 14 Jun 2021 16:38:21 +0100 [thread overview]
Message-ID: <475131.1623685101@warthog.procyon.org.uk> (raw)
In-Reply-To: <YMdpxbYafHnE0F8N@casper.infradead.org>
Matthew Wilcox <willy@infradead.org> wrote:
> > - ASSERT(PageUptodate(page));
> > -
> > if (PagePrivate(page)) {
> > priv = page_private(page);
> > f = afs_page_dirty_from(page, priv);
>
> Why are you removing this assertion? Does AFS now support dirty,
> partially-uptodate pages? If so, a subsequent read() to that
> page is going to need to be careful to only read the parts of the page
> from the server that haven't been written ...
Because the previous hunk in the patch:
+ if (!PageUptodate(page)) {
+ if (copied < len) {
+ copied = 0;
+ goto out;
+ }
+
+ SetPageUptodate(page);
+ }
means you can't get there unless PageUptodate() is true by that point.
David
next prev parent reply other threads:[~2021-06-14 15:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-14 13:20 [PATCH 1/3] afs: Handle len being extending over page end in write_begin/write_end David Howells
2021-06-14 13:20 ` [PATCH 2/3] afs: Fix afs_write_end() to handle short writes David Howells
2021-06-14 13:28 ` Matthew Wilcox
2021-06-14 13:37 ` David Howells
2021-06-14 13:46 ` Matthew Wilcox
2021-06-18 3:40 ` Al Viro
2021-06-14 14:04 ` David Howells
2021-06-14 14:37 ` Matthew Wilcox
2021-06-14 15:38 ` David Howells [this message]
2021-06-14 15:43 ` Matthew Wilcox
2021-06-14 21:11 ` David Howells
2021-06-14 13:20 ` [PATCH 3/3] netfs: fix test for whether we can skip read when writing beyond EOF David Howells
2021-06-15 17:01 ` Jeff Layton
2021-06-14 13:33 ` David Howells
2021-06-17 7:43 ` [PATCH 1/3] afs: Handle len being extending over page end in write_begin/write_end kernel test robot
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